The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 18
... Earth tends to draw together along the axis of spin , and to press out sideways at the Equator . Similarly the spinning medium round a magnetic line of force tends to A B P S R FIG . 5 . draw together lengthways and to bulge out ...
... Earth tends to draw together along the axis of spin , and to press out sideways at the Equator . Similarly the spinning medium round a magnetic line of force tends to A B P S R FIG . 5 . draw together lengthways and to bulge out ...
Страница 69
... Earth , if it were entirely absorbed , would amount only to about 74,000 tons weight.1 This appears a big I use here and elsewhere the energy of sunlight at the distance of the Earth as 25 calories per minute per sq . cm . force , but ...
... Earth , if it were entirely absorbed , would amount only to about 74,000 tons weight.1 This appears a big I use here and elsewhere the energy of sunlight at the distance of the Earth as 25 calories per minute per sq . cm . force , but ...
Страница 70
... Earth due to its gravitation , a force 47 million million times as great . While the Sun , then , is pushing against the Earth with its light , it is pulling it in with its gravitation enormously more . But if the size of the body acted ...
... Earth due to its gravitation , a force 47 million million times as great . While the Sun , then , is pushing against the Earth with its light , it is pulling it in with its gravitation enormously more . But if the size of the body acted ...
Страница 71
... earth was subdivided into equal spheres , each with a radius one 47 million millionth of the radius of the earth , the total light - pressure would equal the total gravitative pull , and if each sphere had the same mean density as the ...
... earth was subdivided into equal spheres , each with a radius one 47 million millionth of the radius of the earth , the total light - pressure would equal the total gravitative pull , and if each sphere had the same mean density as the ...
Страница 75
... earth . Then it is to all intents and purposes a minute planet . Let it be black so that it absorbs all the sunlight ... earth , viz . 51. The push of the sunlight against it will lessen the total pull on it by about 1 in 74,000 . This ...
... earth . Then it is to all intents and purposes a minute planet . Let it be black so that it absorbs all the sunlight ... earth , viz . 51. The push of the sunlight against it will lessen the total pull on it by about 1 in 74,000 . This ...
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angle beam of light black disc black surface blackened calculated circular cloth boards comets convection corpuscles corpuscular theory cubic centimetre deflexion density diameter direction Doppler dynes earth earth's distance effect electric electrified plate emitted energy per cubic ergs exerted experiment Fcap fluorite forward front face give glass gravitation constant gravitative pull greater heat hemisphere incident beam Lebedew light force light-pressure limp cloth magnetic measured medium millionth motion Nernst lamp normal NORTHUMBERLAND AVENUE Note observed torque orbit particles perpendicular Post 8vo PRESSURE OF LIGHT Professor push quartz fibre radiation radiometer action radius refracting repelled repulsion rise in temperature round the sun says shown in fig side sideways solar Solar Constant spinning square centimetre sunlight suppose suspended system tail telescope tion tubes of force UNIVERSITY OF BIRMINGHAM University of Cambridge vacuum velocity of light wave-length waves αρ
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Страница 34 - A flat body exposed to sunlight would experience this pressure on its illuminated side only, and would therefore be repelled from the side on which the light falls. It is probable that a much greater energy of radiation might be obtained by means of the concentrated rays of the electric lamp. Such rays falling on a thin metallic disk, delicately suspended in a vacuum, might perhaps produce an observable mechanical effect.
Страница 82 - The Sun cannot tolerate dust. With the pressure of his light he drives the finest particles altogether away from his system. With his heat he warms the larger particles. They give out this heat again and with it some of that energy which enables them to withstand his attraction. Slowly he draws them to himself and at last they unite with him and end their separate existence.